Though you have many remedies available still you are in a very weak wicket .
1.consesual sex by two adult is not an offence in India .Though you can take the plea that your consent was not free but influenced by promise to marriage
2.Though you presumed it was a natural way of abortion, it was not .Hence your statement to boy was factually in correct .
3.If you wish you can file police complaint but they too can' t do much legally
4.Your one rickless action led to multiple complections and mistrust in the mind of the boy though it may be un intentional .
Since boy lost confidence in you it is difficult to regain .I advice, forget about the incident and move on.